In Compatibility with node 13.5

Describe your question with as much detail as possible Unable to run tests with node 13 as wdio-sync fibers are not getting loaded, got below log while execution:

2019-12-24T01:32:09.621Z DEBUG @wdio/sync: Couldn't load fibers package for Node v10 and above
2019-12-24T01:32:09.624Z DEBUG @wdio/sync: Couldn't load fibers package for Node v8

Tried uninstalling and installing all packages with latest version but no luck.

Environment (please complete the following information):

• WebdriverIO version: 5.18.0
• Mode: WDIO Testrunner
• If WDIO Testrunner, running sync/async: sync
• Node.js version: 13.5.0
• NPM version: 6.13.4
• Browser name and version: Chrome 79
• Platform name and version: MAC
• Additional wdio packages used (if applicable):

     "@wdio/cli": "5.18.1",
    "@wdio/cucumber-framework": "5.16.15",
    "@wdio/local-runner": "5.18.0",
    "@wdio/reporter": "5.15.2",
    "@wdio/spec-reporter": "5.16.11",
    "@wdio/sync": "5.17.0",

[kajmagnus]

@DenysBarkan and others — only this: "fibers": "^5.0.0" didn’t work for me, because Webdriverio v6 depends on Fibers v4. If you just add Fibers v5, it’ll get installed, but Webdriverio continues using v4. (As far as I’ve understoold, looking at yarn.lock.)

But by allso adding a "resolutions": ... entry to force Webdriverio to use Fibers v5, sync started working for me with Nodejs 14.

Here’s my package.json:

{
  ...
  "devDependencies": {
    "@wdio/cli": "=6.10.10",
    ...
    "fibers": "v4.x doesn't work with Nodejs 14, which Ty uses — v12 is EOL (and odd versions like v13 are unstable).",
    "fibers": "5.0.1",
    ...
  },
  "resolutions": {
    "fibers": "Webdriver.io 6 tries to use Fibers 4.x.",
    "fibers": "5.0.1"
  }
}

@christian-bromann

we recommend to switch to async

Yes :- ) I’ve started, however, still about 180 Webdriverio v6 tests left to migrate to v7. About 1 whole week of work. It’s nice that now I can do this a little bit at a time (since I got v6 working with Nodejs 14) instead of all at once. Webdriver is really nice b.t.w. the best e2e test framework I’ve used.

[DenysBarkan]

"node -v" : "v14.15.4"
"@wdio/cli": "^6.6.6"

returns the exception : "DEBUG @wdio/sync: Couldn't load fibers package for Node v10 and above"

instead of the working flow

"node -v" : "v12.20.1"
"@wdio/cli": "^6.6.6"

works without any additional messages.

The downgrade of the node to v12 solves the problem with the issue.